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Diffstat (limited to 'contrib/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp')
| -rw-r--r-- | contrib/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp | 744 |
1 files changed, 744 insertions, 0 deletions
diff --git a/contrib/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp b/contrib/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp new file mode 100644 index 000000000000..b486e4ad0e51 --- /dev/null +++ b/contrib/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp @@ -0,0 +1,744 @@ +//===-- ARMWinEHPrinter.cpp - Windows on ARM EH Data Printer ----*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +// Windows on ARM uses a series of serialised data structures (RuntimeFunction) +// to create a table of information for unwinding. In order to conserve space, +// there are two different ways that this data is represented. +// +// For functions with canonical forms for the prologue and epilogue, the data +// can be stored in a "packed" form. In this case, the data is packed into the +// RuntimeFunction's remaining 30-bits and can fully describe the entire frame. +// +// +---------------------------------------+ +// | Function Entry Address | +// +---------------------------------------+ +// | Packed Form Data | +// +---------------------------------------+ +// +// This layout is parsed by Decoder::dumpPackedEntry. No unwind bytecode is +// associated with such a frame as they can be derived from the provided data. +// The decoder does not synthesize this data as it is unnecessary for the +// purposes of validation, with the synthesis being required only by a proper +// unwinder. +// +// For functions that are large or do not match canonical forms, the data is +// split up into two portions, with the actual data residing in the "exception +// data" table (.xdata) with a reference to the entry from the "procedure data" +// (.pdata) entry. +// +// The exception data contains information about the frame setup, all of the +// epilouge scopes (for functions for which there are multiple exit points) and +// the associated exception handler. Additionally, the entry contains byte-code +// describing how to unwind the function (c.f. Decoder::decodeOpcodes). +// +// +---------------------------------------+ +// | Function Entry Address | +// +---------------------------------------+ +// | Exception Data Entry Address | +// +---------------------------------------+ +// +// This layout is parsed by Decoder::dumpUnpackedEntry. Such an entry must +// first resolve the exception data entry address. This structure +// (ExceptionDataRecord) has a variable sized header +// (c.f. ARM::WinEH::HeaderWords) and encodes most of the same information as +// the packed form. However, because this information is insufficient to +// synthesize the unwinding, there are associated unwinding bytecode which make +// up the bulk of the Decoder. +// +// The decoder itself is table-driven, using the first byte to determine the +// opcode and dispatching to the associated printing routine. The bytecode +// itself is a variable length instruction encoding that can fully describe the +// state of the stack and the necessary operations for unwinding to the +// beginning of the frame. +// +// The byte-code maintains a 1-1 instruction mapping, indicating both the width +// of the instruction (Thumb2 instructions are variable length, 16 or 32 bits +// wide) allowing the program to unwind from any point in the prologue, body, or +// epilogue of the function. + +#include "ARMWinEHPrinter.h" +#include "Error.h" +#include "llvm/ADT/StringExtras.h" +#include "llvm/ADT/STLExtras.h" +#include "llvm/Support/ARMWinEH.h" +#include "llvm/Support/Format.h" + +using namespace llvm; +using namespace llvm::object; +using namespace llvm::support; + +namespace llvm { +raw_ostream &operator<<(raw_ostream &OS, const ARM::WinEH::ReturnType &RT) { + switch (RT) { + case ARM::WinEH::ReturnType::RT_POP: + OS << "pop {pc}"; + break; + case ARM::WinEH::ReturnType::RT_B: + OS << "b target"; + break; + case ARM::WinEH::ReturnType::RT_BW: + OS << "b.w target"; + break; + case ARM::WinEH::ReturnType::RT_NoEpilogue: + OS << "(no epilogue)"; + break; + } + return OS; +} +} + +static std::string formatSymbol(StringRef Name, uint64_t Address, + uint64_t Offset = 0) { + std::string Buffer; + raw_string_ostream OS(Buffer); + + if (!Name.empty()) + OS << Name << " "; + + if (Offset) + OS << format("+0x%X (0x%" PRIX64 ")", Offset, Address); + else if (!Name.empty()) + OS << format("(0x%" PRIX64 ")", Address); + else + OS << format("0x%" PRIX64, Address); + + return OS.str(); +} + +namespace llvm { +namespace ARM { +namespace WinEH { +const size_t Decoder::PDataEntrySize = sizeof(RuntimeFunction); + +// TODO name the uops more appropriately +const Decoder::RingEntry Decoder::Ring[] = { + { 0x80, 0x00, &Decoder::opcode_0xxxxxxx }, // UOP_STACK_FREE (16-bit) + { 0xc0, 0x80, &Decoder::opcode_10Lxxxxx }, // UOP_POP (32-bit) + { 0xf0, 0xc0, &Decoder::opcode_1100xxxx }, // UOP_STACK_SAVE (16-bit) + { 0xf8, 0xd0, &Decoder::opcode_11010Lxx }, // UOP_POP (16-bit) + { 0xf8, 0xd8, &Decoder::opcode_11011Lxx }, // UOP_POP (32-bit) + { 0xf8, 0xe0, &Decoder::opcode_11100xxx }, // UOP_VPOP (32-bit) + { 0xfc, 0xe8, &Decoder::opcode_111010xx }, // UOP_STACK_FREE (32-bit) + { 0xfe, 0xec, &Decoder::opcode_1110110L }, // UOP_POP (16-bit) + { 0xff, 0xee, &Decoder::opcode_11101110 }, // UOP_MICROSOFT_SPECIFIC (16-bit) + // UOP_PUSH_MACHINE_FRAME + // UOP_PUSH_CONTEXT + // UOP_PUSH_TRAP_FRAME + // UOP_REDZONE_RESTORE_LR + { 0xff, 0xef, &Decoder::opcode_11101111 }, // UOP_LDRPC_POSTINC (32-bit) + { 0xff, 0xf5, &Decoder::opcode_11110101 }, // UOP_VPOP (32-bit) + { 0xff, 0xf6, &Decoder::opcode_11110110 }, // UOP_VPOP (32-bit) + { 0xff, 0xf7, &Decoder::opcode_11110111 }, // UOP_STACK_RESTORE (16-bit) + { 0xff, 0xf8, &Decoder::opcode_11111000 }, // UOP_STACK_RESTORE (16-bit) + { 0xff, 0xf9, &Decoder::opcode_11111001 }, // UOP_STACK_RESTORE (32-bit) + { 0xff, 0xfa, &Decoder::opcode_11111010 }, // UOP_STACK_RESTORE (32-bit) + { 0xff, 0xfb, &Decoder::opcode_11111011 }, // UOP_NOP (16-bit) + { 0xff, 0xfc, &Decoder::opcode_11111100 }, // UOP_NOP (32-bit) + { 0xff, 0xfd, &Decoder::opcode_11111101 }, // UOP_NOP (16-bit) / END + { 0xff, 0xfe, &Decoder::opcode_11111110 }, // UOP_NOP (32-bit) / END + { 0xff, 0xff, &Decoder::opcode_11111111 }, // UOP_END +}; + +void Decoder::printRegisters(const std::pair<uint16_t, uint32_t> &RegisterMask) { + static const char * const GPRRegisterNames[16] = { + "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", + "r11", "ip", "sp", "lr", "pc", + }; + + const uint16_t GPRMask = std::get<0>(RegisterMask); + const uint16_t VFPMask = std::get<1>(RegisterMask); + + OS << '{'; + bool Comma = false; + for (unsigned RI = 0, RE = 11; RI < RE; ++RI) { + if (GPRMask & (1 << RI)) { + if (Comma) + OS << ", "; + OS << GPRRegisterNames[RI]; + Comma = true; + } + } + for (unsigned RI = 0, RE = 32; RI < RE; ++RI) { + if (VFPMask & (1 << RI)) { + if (Comma) + OS << ", "; + OS << "d" << unsigned(RI); + Comma = true; + } + } + for (unsigned RI = 11, RE = 16; RI < RE; ++RI) { + if (GPRMask & (1 << RI)) { + if (Comma) + OS << ", "; + OS << GPRRegisterNames[RI]; + Comma = true; + } + } + OS << '}'; +} + +ErrorOr<object::SectionRef> +Decoder::getSectionContaining(const COFFObjectFile &COFF, uint64_t VA) { + for (const auto &Section : COFF.sections()) { + uint64_t Address; + uint64_t Size; + + if (std::error_code EC = Section.getAddress(Address)) + return EC; + if (std::error_code EC = Section.getSize(Size)) + return EC; + + if (VA >= Address && (VA - Address) <= Size) + return Section; + } + return readobj_error::unknown_symbol; +} + +ErrorOr<object::SymbolRef> Decoder::getSymbol(const COFFObjectFile &COFF, + uint64_t VA, bool FunctionOnly) { + for (const auto &Symbol : COFF.symbols()) { + if (FunctionOnly) { + SymbolRef::Type Type; + if (std::error_code EC = Symbol.getType(Type)) + return EC; + if (Type != SymbolRef::ST_Function) + continue; + } + + uint64_t Address; + if (std::error_code EC = Symbol.getAddress(Address)) + return EC; + if (Address == VA) + return Symbol; + } + return readobj_error::unknown_symbol; +} + +ErrorOr<SymbolRef> Decoder::getRelocatedSymbol(const COFFObjectFile &, + const SectionRef &Section, + uint64_t Offset) { + for (const auto &Relocation : Section.relocations()) { + uint64_t RelocationOffset; + if (auto Error = Relocation.getOffset(RelocationOffset)) + return Error; + if (RelocationOffset == Offset) + return *Relocation.getSymbol(); + } + return readobj_error::unknown_symbol; +} + +bool Decoder::opcode_0xxxxxxx(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + uint8_t Imm = OC[Offset] & 0x7f; + SW.startLine() << format("0x%02x ; %s sp, #(%u * 4)\n", + OC[Offset], + static_cast<const char *>(Prologue ? "sub" : "add"), + Imm); + ++Offset; + return false; +} + +bool Decoder::opcode_10Lxxxxx(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + unsigned Link = (OC[Offset] & 0x20) >> 5; + uint16_t RegisterMask = (Link << (Prologue ? 14 : 15)) + | ((OC[Offset + 0] & 0x1f) << 8) + | ((OC[Offset + 1] & 0xff) << 0); + assert((~RegisterMask & (1 << 13)) && "sp must not be set"); + assert((~RegisterMask & (1 << (Prologue ? 15 : 14))) && "pc must not be set"); + + SW.startLine() << format("0x%02x 0x%02x ; %s.w ", + OC[Offset + 0], OC[Offset + 1], + Prologue ? "push" : "pop"); + printRegisters(std::make_pair(RegisterMask, 0)); + OS << '\n'; + + ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_1100xxxx(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + if (Prologue) + SW.startLine() << format("0x%02x ; mov r%u, sp\n", + OC[Offset], OC[Offset] & 0xf); + else + SW.startLine() << format("0x%02x ; mov sp, r%u\n", + OC[Offset], OC[Offset] & 0xf); + ++Offset; + return false; +} + +bool Decoder::opcode_11010Lxx(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + unsigned Link = (OC[Offset] & 0x4) >> 3; + unsigned Count = (OC[Offset] & 0x3); + + uint16_t GPRMask = (Link << (Prologue ? 14 : 15)) + | (((1 << (Count + 1)) - 1) << 4); + + SW.startLine() << format("0x%02x ; %s ", OC[Offset], + Prologue ? "push" : "pop"); + printRegisters(std::make_pair(GPRMask, 0)); + OS << '\n'; + + ++Offset; + return false; +} + +bool Decoder::opcode_11011Lxx(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + unsigned Link = (OC[Offset] & 0x4) >> 2; + unsigned Count = (OC[Offset] & 0x3) + 4; + + uint16_t GPRMask = (Link << (Prologue ? 14 : 15)) + | (((1 << (Count + 1)) - 1) << 4); + + SW.startLine() << format("0x%02x ; %s.w ", OC[Offset], + Prologue ? "push" : "pop"); + printRegisters(std::make_pair(GPRMask, 0)); + OS << '\n'; + + ++Offset; + return false; +} + +bool Decoder::opcode_11100xxx(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + unsigned High = (OC[Offset] & 0x7); + uint32_t VFPMask = (((1 << (High + 1)) - 1) << 8); + + SW.startLine() << format("0x%02x ; %s ", OC[Offset], + Prologue ? "vpush" : "vpop"); + printRegisters(std::make_pair(0, VFPMask)); + OS << '\n'; + + ++Offset; + return false; +} + +bool Decoder::opcode_111010xx(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + uint16_t Imm = ((OC[Offset + 0] & 0x03) << 8) | ((OC[Offset + 1] & 0xff) << 0); + + SW.startLine() << format("0x%02x 0x%02x ; %s.w sp, #(%u * 4)\n", + OC[Offset + 0], OC[Offset + 1], + static_cast<const char *>(Prologue ? "sub" : "add"), + Imm); + + ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_1110110L(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + uint8_t GPRMask = ((OC[Offset + 0] & 0x01) << (Prologue ? 14 : 15)) + | ((OC[Offset + 1] & 0xff) << 0); + + SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0], + OC[Offset + 1], Prologue ? "push" : "pop"); + printRegisters(std::make_pair(GPRMask, 0)); + OS << '\n'; + + ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11101110(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + assert(!Prologue && "may not be used in prologue"); + + if (OC[Offset + 1] & 0xf0) + SW.startLine() << format("0x%02x 0x%02x ; reserved\n", + OC[Offset + 0], OC[Offset + 1]); + else + SW.startLine() + << format("0x%02x 0x%02x ; microsoft-specific (type: %u)\n", + OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] & 0x0f); + + ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11101111(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + assert(!Prologue && "may not be used in prologue"); + + if (OC[Offset + 1] & 0xf0) + SW.startLine() << format("0x%02x 0x%02x ; reserved\n", + OC[Offset + 0], OC[Offset + 1]); + else + SW.startLine() + << format("0x%02x 0x%02x ; ldr.w lr, [sp], #%u\n", + OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] << 2); + + ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11110101(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + unsigned Start = (OC[Offset + 1] & 0xf0) >> 4; + unsigned End = (OC[Offset + 1] & 0x0f) >> 0; + uint32_t VFPMask = ((1 << (End - Start)) - 1) << Start; + + SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0], + OC[Offset + 1], Prologue ? "vpush" : "vpop"); + printRegisters(std::make_pair(0, VFPMask)); + OS << '\n'; + + ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11110110(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + unsigned Start = (OC[Offset + 1] & 0xf0) >> 4; + unsigned End = (OC[Offset + 1] & 0x0f) >> 0; + uint32_t VFPMask = ((1 << (End - Start)) - 1) << 16; + + SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0], + OC[Offset + 1], Prologue ? "vpush" : "vpop"); + printRegisters(std::make_pair(0, VFPMask)); + OS << '\n'; + + ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11110111(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0); + + SW.startLine() << format("0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n", + OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], + static_cast<const char *>(Prologue ? "sub" : "add"), + Imm); + + ++Offset, ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11111000(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + uint32_t Imm = (OC[Offset + 1] << 16) + | (OC[Offset + 2] << 8) + | (OC[Offset + 3] << 0); + + SW.startLine() + << format("0x%02x 0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n", + OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3], + static_cast<const char *>(Prologue ? "sub" : "add"), Imm); + + ++Offset, ++Offset, ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11111001(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0); + + SW.startLine() + << format("0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n", + OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], + static_cast<const char *>(Prologue ? "sub" : "add"), Imm); + + ++Offset, ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11111010(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + uint32_t Imm = (OC[Offset + 1] << 16) + | (OC[Offset + 2] << 8) + | (OC[Offset + 3] << 0); + + SW.startLine() + << format("0x%02x 0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n", + OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3], + static_cast<const char *>(Prologue ? "sub" : "add"), Imm); + + ++Offset, ++Offset, ++Offset, ++Offset; + return false; +} + +bool Decoder::opcode_11111011(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + SW.startLine() << format("0x%02x ; nop\n", OC[Offset]); + ++Offset; + return false; +} + +bool Decoder::opcode_11111100(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + SW.startLine() << format("0x%02x ; nop.w\n", OC[Offset]); + ++Offset; + return false; +} + +bool Decoder::opcode_11111101(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + SW.startLine() << format("0x%02x ; b\n", OC[Offset]); + ++Offset; + return true; +} + +bool Decoder::opcode_11111110(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + SW.startLine() << format("0x%02x ; b.w\n", OC[Offset]); + ++Offset; + return true; +} + +bool Decoder::opcode_11111111(const ulittle8_t *OC, unsigned &Offset, + unsigned Length, bool Prologue) { + ++Offset; + return true; +} + +void Decoder::decodeOpcodes(ArrayRef<ulittle8_t> Opcodes, unsigned Offset, + bool Prologue) { + assert((!Prologue || Offset == 0) && "prologue should always use offset 0"); + + bool Terminated = false; + for (unsigned OI = Offset, OE = Opcodes.size(); !Terminated && OI < OE; ) { + for (unsigned DI = 0;; ++DI) { + if ((Opcodes[OI] & Ring[DI].Mask) == Ring[DI].Value) { + Terminated = (this->*Ring[DI].Routine)(Opcodes.data(), OI, 0, Prologue); + break; + } + assert(DI < array_lengthof(Ring) && "unhandled opcode"); + } + } +} + +bool Decoder::dumpXDataRecord(const COFFObjectFile &COFF, + const SectionRef &Section, + uint64_t FunctionAddress, uint64_t VA) { + ArrayRef<uint8_t> Contents; + if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents)) + return false; + + uint64_t SectionVA; + if (Section.getAddress(SectionVA)) + return false; + + uint64_t Offset = VA - SectionVA; + const ulittle32_t *Data = + reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset); + const ExceptionDataRecord XData(Data); + + DictScope XRS(SW, "ExceptionData"); + SW.printNumber("FunctionLength", XData.FunctionLength() << 1); + SW.printNumber("Version", XData.Vers()); + SW.printBoolean("ExceptionData", XData.X()); + SW.printBoolean("EpiloguePacked", XData.E()); + SW.printBoolean("Fragment", XData.F()); + SW.printNumber(XData.E() ? "EpilogueOffset" : "EpilogueScopes", + XData.EpilogueCount()); + SW.printNumber("ByteCodeLength", + static_cast<uint64_t>(XData.CodeWords() * sizeof(uint32_t))); + + if (XData.E()) { + ArrayRef<ulittle8_t> UC = XData.UnwindByteCode(); + if (!XData.F()) { + ListScope PS(SW, "Prologue"); + decodeOpcodes(UC, 0, /*Prologue=*/true); + } + if (XData.EpilogueCount()) { + ListScope ES(SW, "Epilogue"); + decodeOpcodes(UC, XData.EpilogueCount(), /*Prologue=*/false); + } + } else { + ArrayRef<ulittle32_t> EpilogueScopes = XData.EpilogueScopes(); + ListScope ESS(SW, "EpilogueScopes"); + for (const EpilogueScope ES : EpilogueScopes) { + DictScope ESES(SW, "EpilogueScope"); + SW.printNumber("StartOffset", ES.EpilogueStartOffset()); + SW.printNumber("Condition", ES.Condition()); + SW.printNumber("EpilogueStartIndex", ES.EpilogueStartIndex()); + + ListScope Opcodes(SW, "Opcodes"); + decodeOpcodes(XData.UnwindByteCode(), ES.EpilogueStartIndex(), + /*Prologue=*/false); + } + } + + if (XData.X()) { + const uint32_t Address = XData.ExceptionHandlerRVA(); + const uint32_t Parameter = XData.ExceptionHandlerParameter(); + const size_t HandlerOffset = HeaderWords(XData) + + (XData.E() ? 0 : XData.EpilogueCount()) + + XData.CodeWords(); + + ErrorOr<SymbolRef> Symbol = + getRelocatedSymbol(COFF, Section, HandlerOffset * sizeof(uint32_t)); + if (!Symbol) + Symbol = getSymbol(COFF, Address, /*FunctionOnly=*/true); + + StringRef Name; + if (Symbol) + Symbol->getName(Name); + + ListScope EHS(SW, "ExceptionHandler"); + SW.printString("Routine", formatSymbol(Name, Address)); + SW.printHex("Parameter", Parameter); + } + + return true; +} + +bool Decoder::dumpUnpackedEntry(const COFFObjectFile &COFF, + const SectionRef Section, uint64_t Offset, + unsigned Index, const RuntimeFunction &RF) { + assert(RF.Flag() == RuntimeFunctionFlag::RFF_Unpacked && + "packed entry cannot be treated as an unpacked entry"); + + ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset); + if (!Function) + Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true); + + ErrorOr<SymbolRef> XDataRecord = getRelocatedSymbol(COFF, Section, Offset + 4); + if (!XDataRecord) + XDataRecord = getSymbol(COFF, RF.ExceptionInformationRVA()); + + if (!RF.BeginAddress && !Function) + return false; + if (!RF.UnwindData && !XDataRecord) + return false; + + StringRef FunctionName; + uint64_t FunctionAddress; + if (Function) { + Function->getName(FunctionName); + Function->getAddress(FunctionAddress); + } else { + const pe32_header *PEHeader; + if (COFF.getPE32Header(PEHeader)) + return false; + FunctionAddress = PEHeader->ImageBase + RF.BeginAddress; + } + + SW.printString("Function", formatSymbol(FunctionName, FunctionAddress)); + + if (XDataRecord) { + StringRef Name; + uint64_t Address; + + XDataRecord->getName(Name); + XDataRecord->getAddress(Address); + + SW.printString("ExceptionRecord", formatSymbol(Name, Address)); + + section_iterator SI = COFF.section_end(); + if (XDataRecord->getSection(SI)) + return false; + + return dumpXDataRecord(COFF, *SI, FunctionAddress, Address); + } else { + const pe32_header *PEHeader; + if (COFF.getPE32Header(PEHeader)) + return false; + + uint64_t Address = PEHeader->ImageBase + RF.ExceptionInformationRVA(); + SW.printString("ExceptionRecord", formatSymbol("", Address)); + + ErrorOr<SectionRef> Section = + getSectionContaining(COFF, RF.ExceptionInformationRVA()); + if (!Section) + return false; + + return dumpXDataRecord(COFF, *Section, FunctionAddress, + RF.ExceptionInformationRVA()); + } +} + +bool Decoder::dumpPackedEntry(const object::COFFObjectFile &COFF, + const SectionRef Section, uint64_t Offset, + unsigned Index, const RuntimeFunction &RF) { + assert((RF.Flag() == RuntimeFunctionFlag::RFF_Packed || + RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment) && + "unpacked entry cannot be treated as a packed entry"); + + ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset); + if (!Function) + Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true); + + StringRef FunctionName; + uint64_t FunctionAddress; + if (Function) { + Function->getName(FunctionName); + Function->getAddress(FunctionAddress); + } else { + const pe32_header *PEHeader; + if (COFF.getPE32Header(PEHeader)) + return false; + FunctionAddress = PEHeader->ImageBase + RF.BeginAddress; + } + + SW.printString("Function", formatSymbol(FunctionName, FunctionAddress)); + SW.printBoolean("Fragment", + RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment); + SW.printNumber("FunctionLength", RF.FunctionLength()); + SW.startLine() << "ReturnType: " << RF.Ret() << '\n'; + SW.printBoolean("HomedParameters", RF.H()); + SW.startLine() << "SavedRegisters: "; + printRegisters(SavedRegisterMask(RF)); + OS << '\n'; + SW.printNumber("StackAdjustment", StackAdjustment(RF) << 2); + + return true; +} + +bool Decoder::dumpProcedureDataEntry(const COFFObjectFile &COFF, + const SectionRef Section, unsigned Index, + ArrayRef<uint8_t> Contents) { + uint64_t Offset = PDataEntrySize * Index; + const ulittle32_t *Data = + reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset); + + const RuntimeFunction Entry(Data); + DictScope RFS(SW, "RuntimeFunction"); + if (Entry.Flag() == RuntimeFunctionFlag::RFF_Unpacked) + return dumpUnpackedEntry(COFF, Section, Offset, Index, Entry); + return dumpPackedEntry(COFF, Section, Offset, Index, Entry); +} + +void Decoder::dumpProcedureData(const COFFObjectFile &COFF, + const SectionRef Section) { + ArrayRef<uint8_t> Contents; + if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents)) + return; + + if (Contents.size() % PDataEntrySize) { + errs() << ".pdata content is not " << PDataEntrySize << "-byte aligned\n"; + return; + } + + for (unsigned EI = 0, EE = Contents.size() / PDataEntrySize; EI < EE; ++EI) + if (!dumpProcedureDataEntry(COFF, Section, EI, Contents)) + break; +} + +std::error_code Decoder::dumpProcedureData(const COFFObjectFile &COFF) { + for (const auto &Section : COFF.sections()) { + StringRef SectionName; + if (std::error_code EC = + COFF.getSectionName(COFF.getCOFFSection(Section), SectionName)) + return EC; + + if (SectionName.startswith(".pdata")) + dumpProcedureData(COFF, Section); + } + return std::error_code(); +} +} +} +} + |